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Low latency is one of the most desirable features of partially synchronousByzantine consensus protocols. Existing low-latency protocols have achievedconsensus with just two communication steps by reducing the maximum number offaults the protocol can tolerate (from $f = \frac{n-1}{3}$ to $f =\frac{n+1}{5}$), \textcolor{black}{by relaxing protocol safety guarantees}, orby using trusted hardware like Trusted Execution Environment. Furthermore,these two-step protocols don't support rotating primary and low-cost viewchange (leader replacement), which are important features of many blockchainuse cases. In this paper, we propose a protocol called VBFT which achievesconsensus in just two communication steps without scarifying desirablefeatures. In particular, VBFT tolerates $f = \frac{n-1}{3}$ faults (which isthe best possible), guarantees strong safety for honest primaries, and requiresno trusted hardware. Moreover, VBFT supports primary rotation and low-cost viewchange, thereby improving prior art on multiple axes.

VBFT: Veloce Byzantine Fault Tolerant Consensus for Blockchains